UDP Proxy / Minecraft PE Proxy

Here is a UDP Proxy implemented in Java that can be used for Minecraft Pocket Edition. Inspired by the Node.js implementation. Runs great on Raspberry Pi.

import java.net.*;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class UdpProxy
{
 public static void main(String[] args) throws Exception
 {
  boolean testMode = args.length == 0;
  String serverHost;
  int serverPort;
  int proxyPort;

  if (args.length != 3 && !testMode)
  {
   System.out.println("Use: java UdpProxy <serverhost> <serverport> <proxyport>");
   return;
  }

  if (!testMode)
  {
   serverHost = args[0];
   serverPort = Integer.parseInt(args[1]);
   proxyPort = Integer.parseInt(args[2]);
  }
  else
  {
   serverHost = "192.168.1.114";
   serverPort = 19132;
   proxyPort = 19133;
  }

  new UdpProxy(serverHost, serverPort, proxyPort).runServer();
 }
 
 static final int CONNECTION_TIMEOUT = 60000;
 HashMap<InetSocketAddress, ChannelInfo> channelMap = new HashMap<InetSocketAddress, ChannelInfo>();
 InetSocketAddress serverAddress;
 int proxyPort;

 public UdpProxy(String serverHost, int serverPort, int proxyPort) throws Exception
 {
  InetAddress resolvedAddress = InetAddress.getByName(serverHost);
  this.serverAddress = new InetSocketAddress(resolvedAddress, serverPort);
  this.proxyPort = proxyPort;
 }

 public void runServer() throws Exception
 {
  System.out.println("Listening on " + proxyPort + ", forwarding to " + serverAddress);

  ByteBuffer buff = ByteBuffer.allocate(1024*1024); //this is probably more than necessary
  Selector selector = Selector.open();
  DatagramChannel proxyChannel = addChannel(selector, proxyPort);
  long connectionTestTime = System.currentTimeMillis();
  
  while (true)
  {
   try
   {
    selector.select(10000); //selector.selectNow();
    Iterator<SelectionKey> keyIterator = selector.selectedKeys().iterator();
    
    while (keyIterator.hasNext())
    {
     SelectionKey key = keyIterator.next();
     keyIterator.remove();
     
     if (key.isReadable())
     {
      DatagramChannel currentChannel = (DatagramChannel) key.channel();
      InetSocketAddress localAddress = (InetSocketAddress) currentChannel.socket().getLocalSocketAddress();
      buff.clear();
      InetSocketAddress remoteAddress = (InetSocketAddress) currentChannel.receive(buff);
      buff.flip();
      
      if (!fromServer(remoteAddress))
      {
       ChannelInfo info = channelMap.get(remoteAddress);
       if (info == null)
       {
        DatagramChannel tempChannel = addChannel(selector, serverAddress);
        InetSocketAddress tempAddress = (InetSocketAddress) tempChannel.socket().getLocalSocketAddress();
        info = new ChannelInfo(tempChannel, remoteAddress);
        channelMap.put(remoteAddress, info);
        System.out.println("Added key = " + remoteAddress.toString());
        channelMap.put(tempAddress, info);
        System.out.println("Added key = " + tempAddress.toString());
       }
       
       info.rxTime = System.currentTimeMillis();
       info.channel.send(buff, serverAddress);
      }
      else
      {
       ChannelInfo info = channelMap.get(localAddress);
       if (info != null)
       {
        proxyChannel.send(buff, info.remoteAddress);
       }
      }
     }
    }
    
    //Test & remove old connections
    if (System.currentTimeMillis() - connectionTestTime >= CONNECTION_TIMEOUT)
    {
     connectionTestTime = System.currentTimeMillis();
     Iterator<Map.Entry<InetSocketAddress, ChannelInfo>> entryIterator = channelMap.entrySet().iterator();
     while (entryIterator.hasNext())
     {
      Map.Entry<InetSocketAddress, ChannelInfo> entry = entryIterator.next();
      InetSocketAddress address = entry.getKey();
      ChannelInfo info = entry.getValue();
      if (connectionTestTime - info.rxTime >= CONNECTION_TIMEOUT)
      {
       info.channel.close();
       entryIterator.remove();
       System.out.println("Removed key = " + address.toString());
      }
     }
    }
   }
   catch (Exception ex)
   {
    ex.printStackTrace();
   }
  }
 }
 
 public boolean fromServer(InetSocketAddress address)
 {
  return address.getAddress().equals(serverAddress.getAddress());
 }

 public DatagramChannel addChannel(Selector selector, int bindPort) throws Exception
 {
  DatagramChannel channel = DatagramChannel.open();
  channel.configureBlocking(false);
  channel.socket().bind(new InetSocketAddress(bindPort));
  channel.register(selector, SelectionKey.OP_READ);
  return channel;
 }

 public DatagramChannel addChannel(Selector selector, InetSocketAddress address) throws Exception
 {
  DatagramChannel channel = DatagramChannel.open();
  channel.configureBlocking(false);
  channel.connect(address);
  channel.register(selector, SelectionKey.OP_READ);
  return channel;
 }

 public static class ChannelInfo
 {
  public ChannelInfo()
  {
  }

  public ChannelInfo(DatagramChannel channel, InetSocketAddress remoteAddress)
  {
   this.channel = channel;
   this.localAddress = (InetSocketAddress) channel.socket().getLocalSocketAddress();
   this.remoteAddress = remoteAddress;
  }

  DatagramChannel channel;
  InetSocketAddress localAddress;
  InetSocketAddress remoteAddress;
  long rxTime;
 }
}

Show / Hide Android Soft Keyboard

Here is a helpful utility class for showing and hiding the Android soft keyboard. The code is written in C# using Mono for Android but should be easy to convert to Java. Similar behavior can be accomplished using Window.SetSoftInputMode but unfortunately SetSoftInputMode doesn't always play well with a tab / fragment architecture.

This code is my attempt to simplify the process of manually showing and hiding of the soft keyboard, which is much more complicated than it has a right to be (I blame vague documentation). My earlier attempts to accomplish this were laden with frustrating bugs and strange side-effects. Now, (hopefully) all those bugs and side-effects have been corrected.

By default there is a 200 millisecond delay on the ShowSoftKeyboard method; this is to accommodate any fragment transition animations that may occur. Showing the keyboard while running an animation can result in poor performance so the workaround is to wait until the animation is finished. If you are not using fragment transition animations then the delay can be eliminated.

*Code has been tested on a handful of real devices as well as a wide range of emulator versions (2.2+).

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.Views.InputMethods;
using Android.InputMethodServices;
using Android.Util;

namespace Mobile.Util
{
    public static class ActivityExtensions
    {
        public static void HideSoftKeyboard(this Activity activity)
        {
            new Handler().Post(delegate
            {
                var view = activity.CurrentFocus;
                if (view != null)
                {
                    InputMethodManager manager = (InputMethodManager)activity.GetSystemService(Context.InputMethodService);
                    manager.HideSoftInputFromWindow(view.WindowToken, 0);
                }
            });
        }

        public static void ShowSoftKeyboard(this Activity activity, View view = null, int delay = 200)
        {
            new Handler().PostDelayed(delegate
            {
                view = view ?? activity.CurrentFocus;
                if (view != null)
                {
                    if (view.HasFocus)
                        view.ClearFocus(); //bug fix for older versions of android

                    view.RequestFocus();
                    InputMethodManager manager = (InputMethodManager)activity.GetSystemService(Context.InputMethodService);
                    manager.ShowSoftInput(view, 0);
                }
            }, delay);
        }
    }

    public static class DialogExtensions
    {
        public static void HideSoftKeyboard(this Dialog dialog)
        {
            new Handler().Post(delegate
            {
                var view = dialog.CurrentFocus;
                if (view != null)
                {
                    InputMethodManager manager = (InputMethodManager)dialog.Context.GetSystemService(Context.InputMethodService);
                    manager.HideSoftInputFromWindow(view.WindowToken, 0);
                }
            });
        }

        public static void ShowSoftKeyboard(this Dialog dialog, View view = null, int delay = 200)
        {
            new Handler().PostDelayed(delegate
            {
                view = view ?? dialog.CurrentFocus;
                if (view != null)
                {
                    if (view.HasFocus)
                        view.ClearFocus(); //bug fix for older versions of android

                    view.RequestFocus();
                    InputMethodManager manager = (InputMethodManager)dialog.Context.GetSystemService(Context.InputMethodService);
                    manager.ShowSoftInput(view, 0);
                }
            }, delay);
        }     
    }
}

Raspberry Pi

My Raspberry Pi arrived in the mail today. These things are great and only cost about $35-$40. Lots of fun.

Raspberry Pi Model B

Mono for Android Resource Naming Convention

When you create a default Mono for Android project the included resource files are named using a mixture of uppercase and lowercase letters. Please, do NOT follow this naming convention because this is the cause of a variety of unresolved, mostly minor bugs. Instead name all your resource files using all lowercase letters and underscores. It is much safer to follow this practice as opposed to the one presented by Xamarin.

ActionBarSherlock with Mono for Android

3/7/2013 - I updated the blog post so everything should be current and relevant as of today. This was long overdue, sorry.

For instant gratification try downloading the Xamarin sample project. However this will most likely yield an outdated version of the ActionBarSherlock library.

Today I will explain how to bind the ActionBarSherlock Java library so that it can be used with Mono for Android. ActionBar compatibility is important since over 90% of Android users are still running a pre 3.0 platform. It's a luxury Java programmers have enjoyed for awhile now, which can finally be shared with fellow C# programmers.

The required steps are listed below:

Build the ActionBarSherlock Zip

1. First, if necessary, download and install the latest version of Eclipse along with the ADT Plugin.
2. Next, download the latest version of ActionBarSherlock. After the download finishes extract the library folder from archive.
3. Rename the library folder to actionbarsherlock. In this tutorial, the library folder has been renamed/moved to c:\downloads\actionbarsherlock.
4. Start Eclipse and create a new workspace. In this tutorial, I created a workspace located at c:\projects\actionbarsherlock.
5. Begin creating a new Android project by clicking File -> New -> Other -> Android -> Android Project From Existing Code. Click Next.
6. In the "Root Directory" field, browse to c:\downloads\actionbarsherlock. Check the "Copy projects into workspace" field. Click Finish.
7. Click Project -> Clean and wait for Eclipse to finish building the project. Exit Eclipse after the build is complete. If you encounter any compile errors ensure that you are targetting Java 6+.
8. Open Windows Explorer, and browse to c:\projects\actionbarsherlock\actionbarsherlock. Select the bin, assets, and res folders and add them to a new Zip file. Name the file actionbarsherlock.zip.
9. Now browse to c:\projects\actionbarsherlock\actionbarsherlock\libs and locate the file android-support-v4.jar. No action is required yet, but remember this file location for future use.
10. Later, both the actionbarsherlock.zip and android-support-v4.jar files will be copied into Visual Studio.

Create the Binding Library

1. Open Visual Studio and create a new JAR Bindings Library project (click File -> New -> Project -> Mono for Android -> Java Bindings Library). Name the project ActionBarSherlockBinding and click OK.
2. Click Project -> ActionBarSherlockBinding Properties and change the Target API level to 14+.
3. Add a reference to the Mono.Android.Support.v4 binding library by clicking Project -> Add Reference and switching to the .NET tab. Select the Mono.Android.Support.v4 library and click OK.
4. Now copy the actionbarsherlock.zip and android-support-v4.jar files (from the previous section) into the Jars folder of the ActionBarSherlockBinding project in Visual Studio.
5. In the properties pane, right click on the the actionbarsherlock.zip file and change the Build Action to "LibraryProjectZip". Next, right click on the android-support-v4.jar file and change the Build Action to "ReferenceJar".
6. Open the Metadata.xml file located under the the Transforms folder and replace all of its contents with the XML code below. Save and close the file when finished.
   

   <metadata>
   
     <!-- Don't bind internal packages/classes -->
     <remove-node path="/api/package[starts-with(@name, 'com.actionbarsherlock.internal')]" />
     
     <!-- Normalize the API, forced to use underscore to avoid name conflicts -->
     <attr path="/api/package[@name='android.support.v4.app']" name="managedName">Android.Support.V4.App</attr>
     <attr path="/api/package[@name='com.actionbarsherlock']" name="managedName">ActionBar_Sherlock</attr>
     <attr path="/api/package[@name='com.actionbarsherlock.app']" name="managedName">ActionBar_Sherlock.App</attr>
     <attr path="/api/package[@name='com.actionbarsherlock.view']" name="managedName">ActionBar_Sherlock.View</attr>
     <attr path="/api/package[@name='com.actionbarsherlock.widget']" name="managedName">ActionBar_Sherlock.Widget</attr>
   
   </metadata>
   

   Note: Additional documentation regarding this step can be found here. Lines 6-11 are trivial but line 4 is important.
   
   
7. Build the solution and verify that there are no errors. There will probably be some warnings but it should still build successfully.

Reference the Binding Library

1. In Visual Studio, add a new Android Application project to the existing solution (click File -> Add -> New Project -> Mono for Android -> Android Application). Name the project ActionBarSherlockDemo and click OK.
2. Click Project -> ActionBarSherlockDemo Properties and change the Target API level to 14+.
3. Add a reference to the binding library by clicking Project -> Add Reference and switching to the Projects tab. Select the ActionBarSherlockBinding project and click OK.
4. Also add a reference to the Mono.Android.Support.v4 binding library from the .NET tab of the Add Reference dialog.
5. Rebuild the solution and verify that there are no errors.

Extend the SherlockActivity Class

1. Open Activity1.cs and change it so that it inherits from the ActionBar_Sherlock.App.SherlockActivity class. Documentation for the ActionBarSherlock library is more or less equivalent to the native ActionBar API.
2. Items can be added to the ActionBar by creating a menu resource and overriding the OnCreateOptionsMenu method.
3. Generate the AndroidManifest.xml and then edit it and set the SDK and theme like this:

   <?xml version="1.0" encoding="utf-8"?>
   <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="internalOnly">
     <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="14" />
     <application android:theme="@style/Theme.Sherlock" />
   </manifest>
   

4. Rebuild the solution, deploy to the emulator or device, and congratulations, you're finished!

---

By Request - An ActionBar Tab Example

This is a quick and dirty example of ActionBar tabs with Mono for Android using ActionBarSherlock. This code is only intended as a demonstration of basic concepts. Please refer to the official Android ActionBar documentation for best practices and for a more complete example.

using System;

using Android.OS;
using Android.Views;
using ActivityAttribute = Android.App.ActivityAttribute;
using ActionBarNavigationMode = Android.App.ActionBarNavigationMode;
using Android.Support.V4.App;
using ActionBar_Sherlock.App;
using Tab = ActionBar_Sherlock.App.ActionBar.Tab;

namespace ActionBarSherlockDemo
{
    [Activity(Label = "Tab Activity", MainLauncher = true)]
    public class TabActivity : SherlockFragmentActivity, ActionBar_Sherlock.App.ActionBar.ITabListener
    {
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            SetContentView(Resource.Layout.Main);

            SupportActionBar.NavigationMode = (int)ActionBarNavigationMode.Tabs;
            SupportActionBar.SetDisplayShowTitleEnabled(true);

            Tab tab = SupportActionBar.NewTab();
            tab.SetTag("TAB1");
            tab.SetText("TAB 1");
            tab.SetTabListener(this);
            SupportActionBar.AddTab(tab);
            
            tab = SupportActionBar.NewTab();
            tab.SetTag("TAB2");
            tab.SetText("TAB 2");
            tab.SetTabListener(this);
            SupportActionBar.AddTab(tab);
        }

        public void OnTabSelected(Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        {
            string tag = tab.Tag.ToString();

            Fragment f = SupportFragmentManager.FindFragmentByTag(tag);
            if (f != null)
            {
                ft.Show(f);
                return;
            }

            if (tag == "TAB1")
                f = new TestFragment1();
            else if (tag == "TAB2")
                f = new TestFragment2();

            ft.Add(Resource.Id.fragmentPlaceholder, f, tag);
        }


        public void OnTabUnselected(Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        {
            string tag = tab.Tag.ToString();

            Fragment f = SupportFragmentManager.FindFragmentByTag(tag);
            if (f != null)
            {
                ft.Hide(f);
                return;
            }
        }

        public void OnTabReselected(Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        {
            //Do nothing
        }
    }

    public class TestFragment1 : Fragment
    {
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle)
        {
            return inflater.Inflate(Resource.Layout.test1, container, false);
        }
    }

    public class TestFragment2 : Fragment
    {
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle)
        {
            return inflater.Inflate(Resource.Layout.test2, container, false);
        }
    }
}

ThreadStaticAttribute

Possibly one of the coolest tricks I've learned in awhile, adding the ThreadStaticAttribute to your .NET static field makes it static but only visible or accessible within the context of the current executing thread. So there can be multiple threads executing at the same time, referencing the same thread-static field, but the value returned is potentially different for each individual thread. This allows you to easily share a static value between different classes / methods of a thread while still encapsulating it from other threads. Because of this it is slightly more insulated than a normal static field, and can be useful in some cases where you don't necessarily want to chain-pass an object as a parameter from method to method, especially if the parameter is passed across many different classes with method calls many layers deep.

Perhaps a good use case for the ThreadStaticAttribute is managing database transactions. Often you need to pass the Transaction object between different method calls, and frequently these method calls are divided into different classes. You can declare a separate class that holds a thread-static reference to the current Transaction which eliminates the need to chain pass it as a parameter between the different methods. Of course this is not strictly necessary anymore since the introduction of the TransactionScope class, but guess what, this is basically exactly how the TransactionScope class is implemented - the associated Transaction class maintains a thread-static reference to the current Transaction.

A word of warning though, be careful when using the ThreadStaticAttribute if you are not in complete control of the thread. Examples of potentially dangerous situations are Thread Pools, ASP .NET, and WCF. I'm not saying that you absolutely shouldn't use the ThreadStaticAttribute in these situations, but you need to be knowledgeable about the thread's lifecycle so as to avoid unexpected errors. In cases like these you need to handle when and if the thread is re-used, terminated, or if your code runs on different threads during different phases of its lifecycle. So, if you use the thread-static feature then do so wisely, cautiously, and test thoroughly. It's not a feature you should overuse or abuse, but occasionally it may be a good solution for some niche problem.

Below is an example of actually using the ThreadStaticAttribute:

[ThreadStatic]
private static string foo;

Warning: ThreadStaticAttribute fields are initialized in the static constructor which only executes once. In the example below the variable foo will only be initialized to "TEST" for the first thread, but the value will be null for subsequent threads.

[ThreadStatic]
private static string foo = "TEST";

To work around this problem trying using a property to access and initialize the ThreadStaticAttribute field:

[ThreadStatic]
private static string _foo;

public static string Foo
{
   get
   {
     return _foo ?? "TEST";
   }
}

Note: There's also something new in .NET 4.0 called ThreadLocal, which is similar to ThreadStatic but doesn't require the variable to be static. I may write a separate blog about it sometime in the future.

Links:

• http://blogs.msdn.com/b/jfoscoding/archive/2006/07/18/670497.aspx
• http://www.mahmutkus.com/post/18968396817/threadstatic-usage-can-be-your-enemy
• http://piers7.blogspot.com/2005/11/threadstatic-callcontext-and_02.html

How to Improve SyntaxHighlighter

SyntaxHighlighter is a javascript library that I use on this blog to colorize and display my code snippets. SyntaxHighlighter is a great tool and the author deserves a lot of respect, but the default "select all" and "copy and paste" functionality can be somewhat frustrating. For the last few days I've been troubleshooting various issues with the "select all" and "copy and paste" functionality. Depending on the configuration and the browser, sometimes it copies the text with non-breaking spaces which causes errors in certain IDEs. Other times it copies the text with the wrong indentation or with no line breaks at all.

Even the fact that you can quickly select all of the text is not immediately apparent; SyntaxHighlighter contains a "hidden" feature that allows double clicking the text to select all of it (of course the average user would never know this functionality existed). Finally, when it does select all of the text it copies it from its native, colorized form into a simple, monochrome textarea control that is created dynamically using some javascript magic. The performance can be a little slow, it may cause the view to randomly jump or scroll in Internet Explorer, and the transition just looks a little tacky.

Below is a script you can embed in the header section of your website or blog that will correct some of these problems. It changes the the default behavior of the "select all" operation and it also adds a button to the top-right corner that is clearly labelled "Select All" (you can still double click the text too).

If you use this script for Blogger, be sure to replace any ampersands with & and any less than signs with < and any greater than signs with >. If you don't do this you will get a cryptic error when you try to upload the html. Blogger requires these characters to be escaped since it uses XML.

<!-- jQuery -->
<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js' type='text/javascript'></script>

<!-- Syntax Highlighter Additions START -->
<link href='http://alexgorbatchev.com/pub/sh/current/styles/shCore.css' rel='stylesheet' type='text/css'/>
<link href='http://alexgorbatchev.com/pub/sh/current/styles/shThemeEclipse.css' rel='stylesheet' type='text/css'/>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shCore.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushCSharp.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushJava.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushBash.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushCss.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushJScript.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushSql.js' type='text/javascript'></script>
<script src='http://alexgorbatchev.com/pub/sh/current/scripts/shBrushXml.js' type='text/javascript'></script>

<style>
.syntaxwrapper
{
 position: relative;
}

.syntaxwrapper .toolbar
{
 position: absolute;
 z-index: 10;
 right: -7px;
 top: -17px;
 width: 65px;
 height: 20px;
 line-height: 20px;
 text-align: center; 
 color: #777;
 font-family: arial;
 font-size: 12px;
 cursor: pointer;
}
</style>

<script language='javascript' type='text/javascript'>

 function selectAll(element)
 {
     if (window.getSelection && document.createRange)
     {
         var selection = window.getSelection();
         var range = document.createRange();
         range.selectNodeContents(element);
         selection.removeAllRanges();
         selection.addRange(range);
     }
     else if (document.body.createTextRange)
     {
         var range = document.body.createTextRange();
         range.moveToElementText(element);
         range.select();
     }
 }

 function customizeSyntaxHighlighter()
 {
     var syntax = $('.syntaxhighlighter');
     if (syntax.length == 0)
     {
         setTimeout(function() { customizeSyntaxHighlighter(); }, 100);
         return;
     }

     syntax.each(function(index)
     {
         var selector = $(this);
         var wrapper = $(document.createElement('div')).addClass('syntaxwrapper');
         var toolbar = $(document.createElement('div')).addClass('toolbar').html('Select All');
         var code = selector.find('.code').first();

         selector.wrap(wrapper).before(toolbar);

         toolbar.get(0).onclick = code.get(0).ondblclick =
         function()
         {
             selectAll(code.get(0));
             syntax.scrollLeft(0);
             return false;
         };

         code.find('.line').each(
         function(index)
         {
             //this hack seems to fix all versions of IE
             this.appendChild(document.createTextNode('\r'));
         });
     });
 }

 SyntaxHighlighter.config.bloggerMode = true;
 SyntaxHighlighter.defaults.toolbar = false;
 SyntaxHighlighter.defaults['quick-code'] = false;
 SyntaxHighlighter.all();
 customizeSyntaxHighlighter();
 
</script>
<!-- Syntax Highlighter Additions END -->

Here is the SyntaxHighlighter website:

http://alexgorbatchev.com/SyntaxHighlighter/